Inverted double flare tool to make bubble (ISO) flares?

[64Chevelle]

Hi,

can I use a 45 degree inverted double flare tool to make metric ISO/bubble flares?

If I stop at the first part of the flare it essentially look like a bubble flare, but the flare end degree is probably not 100% correct, but using a soft nickel/copper brake line will allow the flare to bend enough to make a good leak free connection.

OR? Should I reconsider and order an ISO tool from the US to make correct flares (can't find it over here, strangely...)

[neki67]

There will probably be plenty people jumping in telling you that it shouldn't be done that way BUT I can tell you that it works. Just try it and (obviously) be carefull.

[64Chevelle]

Thanks for the tip, I will try it, as long as the connections don't leak under pressure I see no reason that it won't work. There is certainly no reason for the flare to crack/break anyways and the ISO flare has a reputation for being better than the SAE flare.

I will be careful when doing the first couple of testdrives though... :twothumbs

[MonzaRacer]

You can "do it" but if you dont understand, the iso flare has a different back angle and unfortunately while some get away with it I have seen it break off as the angle isnt right and fluid pressure can pop it off. heck you can get an ISO kit from NAPA for what $50?
Kind of silly to risk your life, but then I am sure Ill get ripped for posting this warning.

[64Chevelle]

Thanks for the warning. Ok course I get the point that the angles are different (which I already knew), 37 vs 45 degrees. I believe it also matters what kind of material you use for the flares. I'm using nickel/copper alloy tubing which is quite soft and the 45 degree flares should bend to the right angle when tightened. On the other hand, I want to make this right and do everything correct so I don't feel confident about it. The tool is going to cost me $150 before I have it in my hands here in Europe, that's why I asked.

Besides, anything sure is better than the lines I replaced, copper tubing with a few of the flares actually inverted single flares. And I've been happily unaware of this and driving the car for 10 years.

[John Wright]

Besides, anything sure is better than the lines I replaced, copper tubing with a few of the flares actually inverted single flares. And I've been happily unaware of this and driving the car for 10 years.
Yikes!....that was a good find, glad that you were paying attention and found it.

[64Chevelle]

I bet there are a lot of these old cars running with the same kind of brake and other crucial safety issues... Scary, but true. I just didn't know better until I started working on my car. This is my first project and it's already 6 months overdue, aiming for next spring :)